I HAVE 5 RECEIVERS 2- GWS 4P 1 JRSPORT RS6UL 1-HITEC 05S AND 1- HITEC ELECTRON-6 ALL WORK FINE. THE HITEC ELECTRON-6 HAS A CH-60 CRYSTAL THE REST HAVE NO CRYSTALS. PLEASE MAKE OFFER ON ONE OR ALL sold the hitec electron-6 and the hitec o5s